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Theorem enrefg 6930
Description: Equinumerosity is reflexive. Theorem 1 of [Suppes] p. 92. (Contributed by NM, 18-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.)
Assertion
Ref Expression
enrefg (𝐴𝑉𝐴𝐴)

Proof of Theorem enrefg
StepHypRef Expression
1 f1oi 5617 . . 3 ( I ↾ 𝐴):𝐴1-1-onto𝐴
2 f1oen2g 6921 . . 3 ((𝐴𝑉𝐴𝑉 ∧ ( I ↾ 𝐴):𝐴1-1-onto𝐴) → 𝐴𝐴)
31, 2mp3an3 1360 . 2 ((𝐴𝑉𝐴𝑉) → 𝐴𝐴)
43anidms 397 1 (𝐴𝑉𝐴𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  wcel 2200   class class class wbr 4084   I cid 4381  cres 4723  1-1-ontowf1o 5321  cen 6900
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4203  ax-pow 4260  ax-pr 4295  ax-un 4526
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3890  df-br 4085  df-opab 4147  df-id 4386  df-xp 4727  df-rel 4728  df-cnv 4729  df-co 4730  df-dm 4731  df-rn 4732  df-res 4733  df-ima 4734  df-fun 5324  df-fn 5325  df-f 5326  df-f1 5327  df-fo 5328  df-f1o 5329  df-en 6903
This theorem is referenced by:  enref  6931  eqeng  6932  domrefg  6933  mapdom1g  7026  fidifsnen  7050  nnfi  7052  onenon  7377  oncardval  7379  cardonle  7380  dju1en  7416  xpdjuen  7421  iseqf1olemqf1o  10756  hashun  11055  lgseisenlem2  15787
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